| Taxonomies | A collection of controlled vocabulary terms organised into a hierarchical structure. Each term in a taxonomy is in one or more parent-child relationships to other terms in the taxonomy. |
| Folksonomies | The output from collaboratively creating and managing tags to annotate and categorize content. Metadata is generated not only by experts but also by creators and consumers of the content. Usually, freely chosen keywords are used instead of a controlled vocabulary. A good source of terms for contributing to other semantic models. |
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